The results show that toughness of the coarse grained HAZ is improved after second welding heat cycle except intercritical two-phase heating.

力学性能测试结果表明，除在临界二相区加热外，二次热循环均使粗晶区得到初化。

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With the methods of the pre-heating before welding, controlling the interlaminar temperature and the heat treatment after welding, the welds that satisfy the quality specifications can be available.

通过焊前预热、层间温度控制及焊后热处理等手段获得了满足质量要求的焊缝。

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The techniques for repair are studied after crack arrest in metal dies using electromagnetic heating, such as electrical spark melt joining, reinforced build-up welding and brush electroplating.

研究了各种实际金属模具中裂纹电磁热止裂后的修复技术，如电火花放电熔焊搭桥、强化堆焊、刷镀等；

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